31447081 has 2 divisors, whose sum is σ = 31447082. Its totient is φ = 31447080.

The previous prime is 31447079. The next prime is 31447099. The reversal of 31447081 is 18074413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26677225 + 4769856 = 5165^2 + 2184^2 .

It is a cyclic number.

It is not a de Polignac number, because 31447081 - 2¹ = 31447079 is a prime.

It is a super-2 number, since 2×31447081² = 1977837806841122, which contains 22 as substring.

Together with 31447079, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31447001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15723540 + 15723541.

It is an arithmetic number, because the mean of its divisors is an integer number (15723541).

Almost surely, 2^31447081 is an apocalyptic number.

It is an amenable number.

31447081 is a deficient number, since it is larger than the sum of its proper divisors (1).

31447081 is an equidigital number, since it uses as much as digits as its factorization.

31447081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 31447081 is about 5607.7696992655. The cubic root of 31447081 is about 315.6410260268.

The spelling of 31447081 in words is "thirty-one million, four hundred forty-seven thousand, eighty-one".